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United States Patent | 6,185,015 |
Reinhorn ,   et al. | February 6, 2001 |
A planar optical correlator including at least first and second optical substrates (30, 32), through which light propagates by means of total internal reflection, at least first and second holographic lenses (20, 22) on the first optical substrate and optical third and fourth holographic lenses (24, 26) on the second optical substrate, each of the first and second and third and fourth holographic lenses performing a Fourier transformation on the input light to their respective optical substrates, the substrates positioned such that the second and third holographic lenses at least partially face each other. A filter (36) is positioned between the second and third holographic lenses.
Inventors: | Reinhorn; Silviu (Mevaseret Zion, IL); Friesem; Asher (Rehovot, IL); Amitai; Yaakov (Rehovot, IL) |
Assignee: | Yeda Research & Development Co. LTD (Rehovot, IL) |
Appl. No.: | 445687 |
Filed: | March 7, 2000 |
PCT Filed: | June 11, 1998 |
PCT NO: | PCT/IL98/00269 |
371 Date: | March 7, 2000 |
102(e) Date: | March 7, 2000 |
PCT PUB.NO.: | WO98/57236 |
PCT PUB. Date: | December 17, 1998 |
Jun 12, 1997[IL] | 121067 |
Current U.S. Class: | 359/15; 359/19; 359/29; 359/34; 359/561; 385/14 |
Intern'l Class: | G02B 005/32 |
Field of Search: | 359/15,19,29,34,561 356/71,347 382/210,278,280 385/14 |
5627678 | May., 1997 | NIshii et al. | 359/561. |
Foreign Patent Documents | |||
4-354076 | Dec., 1992 | JP. |
Reinhorn, S. et al, "Fourier Transformation with a Planar Holographic Doublet", Optics Letters, vol. 20, No. 5, Mar. 1, 1995, pp. 495-497. Jahns, J. et al, "Imaging with Planar Optical Systems", Optics Communications, vol. 76, No. 5,6, May 15, 1990, pp. 313-317. Glaser, I, "Compact Lenslet-Array-Based Holographic Correlator/Convolver", Optics Letters, vol. 20, No. 14, Jul. 15, 1995, pp. 1565-1567. Paek, E. et al., "Holographic Associative Memory for Word-Break Recognition", Optics Letters, vol. 14, No. 4, Feb. 15, 1989, pp. 205-207. |
Kernel size Input size Response time Volume Correlator type (pixels) (pixels) (sec.) (cc.) Microprocessor 32 .times. 32 512 .times. 512 .about.10.sup.2 <1 DSP chip 32 .times. 32 512 .times. 512 .about.1 <1 Dedicated electronic 7 .times. 7 512 .times. 512 .about.10.sup.-1 .about.10 Coherent optical (folded) 64 .times. 64 64 .times. 64 .ltoreq.10.sup.-3 .about.500 Lenslet array correlator 32 .times. 32 512 .times. 512 .ltoreq.10.sup.-3 .about.20